如何利用HttpModule给Url追加参数?

Question

现在我们团队在开发手机站,当中遇到一个问题.就是每张页面得传一个参数,而这个参数又不是从固定的页面进来的,也就是说无论从哪张页面进来,参数都要全站点的页面传下去,目前找不到解决办法.从网上down了一篇代码,可是RegexResource.ACTION,RegexResource.HREF报错,麻烦高手帮忙解决一下.下面我把代码贴上,小弟跪谢...   using System;using System.Text;using System.Web;using System.IO;using System.Text.RegularExpressions; namespace ThreeHegemony.Utility{       /// <summary>    /// Auther:      Jess.zou    /// Create data: 2009-08-06    /// Description: 该类作用在Url地址后自动添加(cid)    /// </summary>    public class AutoAddCid : System.Web.IHttpModule    {        public void Init(HttpApplication context)        {            context.PostRequestHandlerExecute += new EventHandler(this.OnPreSendRequestContent);        }         protected void OnPreSendRequestContent(Object sender, EventArgs e)        {            System.Web.HttpApplication myContext = (System.Web.HttpApplication)sender;            myContext.Response.Filter = new AppendSIDFilter(myContext.Response.Filter);        }         private void ReUrl_BeginRequest(object sender, EventArgs e)        {            string cid = "";            string url = "";            HttpContext context = ((HttpApplication)sender).Context;            if (string.IsNullOrEmpty(context.Request.QueryString["cid"]))            {                if (context.Request.QueryString.Count == 0)                {                    url = string.Format("{0}?cid={1}", context.Request.RawUrl, cid);                }                else                {                    url = string.Format("{0}&cid={1}", context.Request.RawUrl, cid);                }            }            context.RewritePath(url);        }         public void Dispose() { }         public class AppendSIDFilter : Stream        {            private Stream Sink { get; set; }            private long _position;            private System.Text.StringBuilder oOutput = new StringBuilder();             public AppendSIDFilter(Stream sink)            {                Sink = sink;            }             public override bool CanRead            {                get { return true; }            }             public override bool CanSeek            {                get { return true; }            }             public override bool CanWrite            {                get { return true; }            }             public override long Length            {                get { return 0; }            }             public override long Position            {                get { return _position; }                set { _position = value; }            }             public override long Seek(long offset, System.IO.SeekOrigin direction)            {                return Sink.Seek(offset, direction);            }             public override void SetLength(long length)            {                Sink.SetLength(length);            }             public override void Close()            {                Sink.Close();            }             public override void Flush()            {                Sink.Flush();            }             public override int Read(byte[] buffer, int offset, int count)            {                return Sink.Read(buffer, offset, count);            }             public override void Write(byte[] buffer, int offset, int count)            {                if (string.IsNullOrEmpty(HttpContext.Current.Request["cid"]))                {                    Sink.Write(buffer, 0, buffer.Length);                    return;                }                 string content = System.Text.UTF8Encoding.UTF8.GetString(buffer, offset, count);                 Regex regex = new Regex(RegexResource.HREF, RegexOptions.IgnoreCase);                Regex action_regex = new Regex(RegexResource.ACTION, RegexOptions.IgnoreCase);                 if (regex.IsMatch(content))                {                    content = Regex.Replace(content, RegexResource.HREF, new MatchEvaluator(ReplaceSID), RegexOptions.Compiled | RegexOptions.IgnoreCase);                }                 if (action_regex.IsMatch(content))                {                    content = Regex.Replace(content, RegexResource.ACTION, new MatchEvaluator(ReplaceSID), RegexOptions.Compiled | RegexOptions.IgnoreCase);                }                 byte[] data = System.Text.UTF8Encoding.UTF8.GetBytes(content);                Sink.Write(data, 0, data.Length);            }             public static string ReplaceSID(Match match)            {                if (match.Value.IndexOf("cid=") != -1)                {                    return match.Value;                }                 string result;                 if (match.Value.IndexOf('?') == -1)                {                    result = match.Value.Insert(match.Value.Length - 1, "?cid=" + HttpContext.Current.Request["cid"]);                }                else                {                    result = match.Value.Insert(match.Value.Length - 1, "&amp;cid=" + HttpContext.Current.Request["cid"]);                }                 return result;            }        }    }}

Answer 1

无论从哪张页面进来,参数都要全站点的页面传下去

 

既然是这样的话楼主为什么非要使用url传参来实现呢，定义全局变量，或者使用Session来存储要传递的参数岂不是更好？

Answer 2

手机站点对于session来讲不适合,因为有时候会没有信号,这样session就中断了.

Answer 3

由于我们这个项目是用于手机的,如果用session的话是可以保存参数的值,但是用户保存的页面的路径中没有这个参数的话,他下一次用这个路径来登的话那我们就永远取不到值的.

Answer 4

不是很懂，cookie可以满足要求吗？

Answer 5

cookie 是不行的

Answer 6

根据你的需求

目前用Global.cs处理相对简单，引入也方便，具体步骤和原理和和httpmodule一致如下：

1：截取输出前的内容文本

2：正则取出所有href的链接

3：循环替换href的链接

4：输出到客户端

这里有两篇文章：是处理页面标题的，不过方式是一致的，只是需要处理的正则需要发现点变化：

1：一个页面标题和过滤输出的解决方案(上)

2：一个页面标题和过滤输出的解决方案(下)